Garden Mysteries: Can You Name These Blooms?

From time to time a plant pops up in the garden that either I forgot the name of, or never knew in the first place. Sometimes these mystery plants are weeds, sometimes they're not. But still, I'd prefer to have some idea of everything growing in my garden. Which is where I'm hoping you come in, Internet. I have quite the collection of the pretty blooms above, but have no idea what they are.

After further research and going through my seed packets, I think these are Sweet William. What threw me off is that I didn't plant Sweet William this year and the green spiky head of the flower is not what I expected Sweet William to look like. Mystery solved at least.

There is magenta and light pink varieties so far.

And then there are two of these tall spindly plants with white blooms. They're not so pretty and I'm hoping they're not weeds. Any and all clues to the identity of thesep lants are most appreciated!

Friend or Foe?

Can someone help me out and tell me if this is a weed? The foliage looks like a weed to my untrained eye, but the flower is so pretty. I can't think what I could have planted that might look like this though. Almost every unexpected plant that pops up around these parts usually turns out to be a weed.

Garden Mysteries: What the Frick Is This?

The picture does not do it justice; this is one wicked looking plant that is growing out form under my box hedge. Check out the bloom in the top left. But is it a friend or foe?

Actually it's one FAST-growing wicked looking plant. I swear it wasn't there yesterday when I was weeding. It seems like everything in the garden is loving this cool, wet weather.

I can't wait to see what the flower looks like.